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Home >> Cadillac >> 2006 >> STS Base, 3.6 7, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 25 (Engine Mechanical - 4.6L (LH2) - 4 Of 5) >> Off-Vehicle Repair Instructions (Part 3) >> Water Pump Cleaning and Inspection - Off Vehicle

Water Pump Cleaning and Inspection - Off Vehicle

WARNING: This page is about a different variant/trim than selected.
    NOTE: Do not immerse the water pump in solvent. The solvent may enter the water pump's permanently lubricated bearings and cause premature bearing failure.
    Fig 1: Locating Water Pump Hub
    GM1254527Courtesy of GENERAL MOTORS CORP.
  1. Rotate the water pump hub (1). The water pump hub and impeller should turn straight and smoothly. If the hub wobbles, is noisy or feels "lumpy" when turned, replace the water pump.
    2. Fig 2: Locating Water Pump Shaft & Weep Hole
    GM1040794Courtesy of GENERAL MOTORS CORP.
  2. Examine the water pump shaft (1) and the weep hole (2) in the water pump body for signs of leakage. If coolant leakage is evident, replace the water pump.
    3. Fig 3: Identifying Water Pump Sealing Surface
    GM1040800Courtesy of GENERAL MOTORS CORP.
  3. Examine the water pump sealing surface (1) for imperfections. If imperfections cannot be repaired, replace the water pump.
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